Magnetic sensor including sensor elements of bridge circuits arranged along a partial circle circumference about a center of the sensor elements

A magnetic sensor includes first and second bridge circuits. The first bridge circuit includes a first group of magnetoresistive elements connected in a bridge. The first bridge circuit outputs a first detection signal corresponding to a magnetic field detected by the magnetoresistive elements in the first group. The second bridge circuit includes a second group of magnetoresistive elements connected in a bridge. Each magnetoresistive element of the first and second bridge circuits is formed by a sensor element bent in a serpentine manner. The second bridge circuit outputs a second detection signal corresponding to a magnetic field detected by the magnetoresistive elements in the second group and having a waveform that has a sine-cosine relationship with the first detection signal. The sensor elements of the first and second bridge circuits are arranged along a circumference of part of a circle about a center of the sensor elements.